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H2O Formation Equation.

NaOH(aq) < = > Na+(aq) + OH-(aq)

HAcetic(aq) < = > H+(aq) + Acetic-(aq)

OH-(aq) + H+(aq) < = > H2O

An hydroxide ion (OH-) is basic or alkaline

An hydrogen ion (H+) is acidic.

A water molecule (H2O) is neutral

It can be seen from the above equations that it requires one molecule of NaOH (sodium hydroxide) to neutralize one molecule of HAcetic (Acetic Acid).